Located or operating beneath the earth's surface
Many of the lakes are connected by subterranean channels, and a change in the surface of one lake is often accompanied by a change in the surface of another.
Near Fasano are two small subterranean chapels with paintings of the 11th century A.D.
The word, which signifies darkness, is in Homer the gloomy subterranean region through which the departed shades pass into Hades.
Hadrian took from masters the power of life and death and abolished the subterranean prisons.
The so-called Labyrinth, near the ruins of Gortyna, was a subterranean quarry from which the city was built.